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Performance Analysis of an AMC System with an Iterative V-BLAST Decoding Algorithm

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International Journal of Communications, Network and System Sciences 2008年第2期1卷 119-123页

作者： Sangjin ryoo Kyunghwan LEE intae HWANG Department of Electronics & Computer Engineering Chonnam National University Korea Department of Electronics Engineering Chonnam National University Korea T&M Algorithm Research Innowireless Inc. Korea

In this paper, the iterative Vertical-Bell-lab Layered Space-Time (V-BLAST) decoding algorithm of an Adaptive Modulation and Coding (AMC) system is proposed, and the corresponding MIMO scheme is analyzed. The proposed decoding algorithm adopts iteratively extrinsic information from a Maximum A Posteriori (MAP) decoder as an a priori probability in the two decoding procedures of the V-BLAST scheme of ordering and slicing in an AMC system. Furthermore, the performance of the proposed decoding algorithm is compared with that of a conventional V-BLAST decoding algorithm and a Maximum Likelihood (ML) decoding algorithm in the combined system of an AMC scheme and a V-BLAST scheme. In this analysis, each MIMO schemes are assumed to be parts of the system for performance improvement.

关键词： Iterative V-BLAST Decoding MAP Decoder AMC STD Turbo Code

Fingerprint-Based Millimeter-Wave Beam Selection for Interference Mitigation in Beamspace Multi-User MIMO Communications

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Computers, Materials & Continua 2021年第1期66卷 59-70页

作者： Sangmi MoonHyeonsung Kim Seng-Phil Hong Mingoo Kang intae Hwang Department of Electronic Engineering Chonnam National UniversityGwangju61186Korea Hancom With Inc. Seongnam-si13493Korea Division of Information&Telecommunication Hanshin UniversityOsan-si18101Korea

Millimeter-wave communications are suitable for application to massive multiple-input multiple-output systems in order to satisfy the ever-growing data traffic demands of the next-generation wireless ***,their practical deployment is hindered by the high cost of complex hardware,such as radio frequency(RF)*** this end,operation in the beamspace domain,through beam selection,is a viable ***,the conventional beam selection schemes focus on the feedback and exhaustive search *** addition,since the same beam in the beamspace may be assigned to a different user,conventional beam selection schemes suffer serious multi-user *** addition,some RF chains may be wasted,since they do not contribute to the sum-rate ***,a fingerprint-based beam selection scheme is proposed to solve these *** proposed scheme conducts offline group-based fingerprint database construction and online beam selection to mitigate multi-user *** the offline phase,the contributing users with the same best beam are *** grouping,a fingerprint database is created for each *** the online phase,beam selection is performed for purposes of interference mitigation using the information contained in the group-based fingerprint *** simulation results confirm that the proposed beam selection scheme can achieve a signal-to-interference-plus-noise ratio and sum-rate performance which is close to those of a fully digital system,and having much higher energy efficiency.

关键词： Beam selection beamspace group-based fingerprint interference mitigation millimeter-wave

Performance Analysis of the D-STTD Communication System with AMC Scheme

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International Journal of Communications, Network and System Sciences 2009年第5期2卷 325-329页

作者： Jeonghwan LEE Gilsang YOON Namgil LEE Sangjin ryoo Cheolwoo YOU intae HWANG Department of Communications Engineering Myongji University Seoul Korea Department of Computer Media Hanyeong College Yeosu Korea Department of Information & Communication System Kochang Korea Polytechnic College Gochang Korea School of Electronics & Computer Engineering Chonnam National University Gwangju Korea

In this paper, we propose a Double-Space Time Transmit Diversity (D-STTD) communication system with Adaptive Modulation and Coding (AMC) scheme and analyze its performance using simulation experiments. The simulation results show that the probability of selecting a high Modulation and Coding Scheme (MCS) level increased as the Signal to Noise Ratio (SNR) improved. Furthermore, the D-STTD communication system with AMC scheme provided a more uniform throughput distribution throughout the entire SNR range compared to its counterpart which did not apply AMC scheme. Also, the maximum throughput of the D-STTD communication system with AMC scheme was twice that of a conventional AMC communication system or a Space Time Transmit Diversity (STTD) communication system with AMC scheme.

关键词： AMC MCS Level STTD D-STTD

AOP event manager in open service gateway

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重庆邮电大学学报（自然科学版） 2007年第3期19卷 335-338页

作者： intae Kim Unkee Kim Keewook Rim Junghyun Lee Department of Computer Science and Information Engineering Inha University Department of Computer and Information Science Sun Moon University

The Open Service Gateway Initiative (OSGi) has played an important role in ubiquitous environments that support interoperability among embedded devices, such as home appliances and network devices. However, the OSGi does not have a common event mechanism yet, and it is difficult to communicate among services asynchronously. In the present work, a common event manager, Aspect-Oriented Event Manager (AOEM), was designed on an OSGi framework. AOEM supports services to generate and provide notification of events. This paper presents the implementation of AOEM as an OSGi bundle with AspectJ. The experiment on transferring between device service and application service demonstrate that AOEM provides good abstraction of the services and convenience.

关键词：开放式网关框架视点定向事件管理器设计驱动程序 AOP